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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db89871f54e1b78a8ad5e113ccce2e757374f2a320409b7637a8cbe1dea8fb79' 
  AND token = 'mqrP+sa0J2Yigo+Sj+TNwoWtkx0RWdSlUGiVXahOCB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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