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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82e61ae7d3f9905d9fbc05d2c9875c95b2e9f16ed007a8a4ad1ddb4562638fd' 
  AND token = 'd/Y5xKy884x0FP7icb+hVIMitp7yBO2U0Gq8GPRtWJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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