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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf0cfd16a8b2fc8506833e1afa3bbe03a4cc27a3a6e1e3fa589bb168ad169d4' 
  AND token = 'pc1hHB87TyunEtsV7HrQOsxfuBVtB8ofBMVW9mC9iJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}