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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869748b94f826566095423bd7014eabd57c4f0b3a727009688c0522088d051ce' 
  AND token = '2Y0K8r4pqkbyDhJHos2nT1q7lm7QtWstmXo1tXR+OLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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