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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2575d4841954cae3880092e8897f5e3ad0f632d1088f1c97718f1eb533297af' 
  AND token = '049M4zmklmgsDcXRrx6kPvLBVL05sZIzuhg5TeZECds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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