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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0adc8d76c0fc111b0abd8c0edc3957fa758129caa190dfc45a03ccc040e8b3e' 
  AND token = 'G9fcJPG87n4JeBO2Dopqt8ZxWfpoM2JChEBt33b3mi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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