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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e75cff0a7c06ca35973d0ac939a95b548439a4f0007d78bd5e1b736f8df084' 
  AND token = 'bHHnEqJYxVBZ0kxwHdqt9Q+kITcT8oPqi9gKcaMwIEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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