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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b84ab19cf9e293a39984fcf7dae7a348aa294cad7644b5fe3af850b799e9b7c' 
  AND token = '4bS3P6XDo5IB8aDvmA6RHHSa7Fnj2MQhySKRnGvv5NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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