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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fda83b373497a7b2ae1380d6810ad0a1777e1b5e46de3aafd4dc58b9e27cd7' 
  AND token = '/aRkYc4qZNse7FJ2HcJ7eTKXcrduZ2Fg5FlyZH0hUBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00267

JSON explain

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