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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7fecd6b8641f31acd017b19dbb33b4b494b43dfffbec9aa3b381c90fff15e8' 
  AND token = 'CeYxQPRPLgHxbo6ZJvKyu2iig3FSpt7hHA6nze+M56Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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