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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a797b24bde0bb99680d6be6e2eaa2d91393d63ecdf41ae2e5c5399ea7e3d0517' 
  AND token = 'WItbReKbz8Zii8SF033+8aZrnINsSGAJHIdFQ9Y4G/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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