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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6699207ed6812a1bb68f89d3eecb268358f4e33ec518a081605202d193471080' 
  AND token = '0rLhhbJP5UUCw2BH8xcKAfgYloBNegj6LL2m20czvzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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