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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beee1543b54aa982dcac57ffec6b542ca87059620b5076a0c61b588a4f7ea1ad' 
  AND token = '7IffA1Fd6aP0PiwvV/seJ7v/VKRmMrNpupCdQxI95WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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