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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af50d5faa7c481e172aa6b817332bef9471ec62b12a8f4a5c2c16ffe663ba20' 
  AND token = 'NdWDMUgjRq57gy8vkZCUzA38dfp32Kp2twkIXZNdwlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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