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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f9fa9bed3203814f3b9fbce0c6cd9bfcf100804a19417919b5a4d9c413b524' 
  AND token = 'lZIbzSstNRHYorQY9LgfMZE/2IJ/+ZmoNYZVWtTWruA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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