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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9af4195cd38e460737da674531df850edd3b0d5f4a76746400e2fea2698733' 
  AND token = '2DfekICg0bCJ5fUQdeM2nPQcEE/KZ1j30cxTnxt6Vvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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