SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b501731a16cf7fb27bdf3c1e288a56c3ed4cb94137424d5d6dfb9d57b77efe' 
  AND token = '5YsxGJ99GINptc/XiOFVotTWqA8/H4B0qz4ip8IZMhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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