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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a54cf8ac3996775cbc2e6b8b3c7b3c75f4ade4f9d61b1a701e9744c74d6f85' 
  AND token = 'l6YkXdf4LYLOOqlIWnp9yQ5iirnaVZ6OSr8AggQ5Ggg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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