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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5310db3d53ab31a7240e73c64d52797a6c6a6b464c8d4a6a028d8379a066bfaa' 
  AND token = 'O6SWREnBFAfcuP8pWpisDNdll02ODGXm3Zb9TkEiRx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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