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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554d0f962bba9e0a01f0ebec317e7c79644b11d1279a84b5f804936982a4f2dd' 
  AND token = 'aLlXqKBhc5u0yYl7Z4BIJIpxeiyCRSuceAPf4pM9Ogc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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