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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8524d8bbef3e3763eae97eaa2ffbf0b74f23431aafcbeb0e6dd4d8a72dc7feda' 
  AND token = 'mx9HOoCbm2TKLxnk/VqZ08gdyR6Ga0NwP/VR3JjwnFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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