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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c1ab6ce82a4771223b7061cc25b75e1ae1ae8f606404269dc1f52a17973713' 
  AND token = 'rIgBkaIqLlSM9OwxWp74DpapABj1XMMrxZnrVYz+R/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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