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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c3c269e2111c0979601f625b21d4d41c92875ad8a7202ba6062ca14c92fea9' 
  AND token = 'eOKWEibv/A+ffMCXs//AQSqcOo6DFdIQkM2kf6cFVkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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