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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92373d0e548128a10c210316af62b724b149a28b7a2219f4769cb7365af07f29' 
  AND token = 'i8qbN1fyJcSruamc4n1IrZtLPeMuqO5ckTp6fH7rAK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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