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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dab33c69b7969a6e8c7776e91e572f4f3bda5d8aed202a9c8fa3cbe234cf9ac' 
  AND token = '4J3tG1i84K+TZHQqrL0REy8GnIwc7ZXJaDzGEraTYkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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