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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219107bdf7776e8122b0892ce7bae21e193e76b0b4858fc033fd7976fc4e4825' 
  AND token = 'KlhN49aPyjWG2+2Q7qyerD5/DLnu05Xuua5mo0pYxVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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