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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984cec86161c5d28eabd68039f736c26e9bbefa73b4f1776e5adf2ba42799b1a' 
  AND token = '8RA8QwJUz9Cm+0zApJOjz6LJiUb4mPrGoan4E4/8l6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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