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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f90ca241797543db5b852cf091ed0b94885b6da79d7ef70b17f825382764dd7' 
  AND token = 'Jzk5/iO31XYWIDua7GJAlESZOaz+A46nRccOzm4Nayg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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