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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f9a40f7af84b8d8ce52f653419b95eb3e6bab46052b2293a90dfc4690663d3' 
  AND token = 'bxnlMFJqkX9tR/u1lNe6AkFMhiC6S+JzYhqDquXW2EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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