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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4683454b3f0c427eaed6b70490ca08de97fa5dfac6eef6873d0e901caf81366e' 
  AND token = 'z9BA0crx/HZilN9Qyv9yGeiD5Ai09dGiC6EjUtplkso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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