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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cc0e53670ae2f93335981d45b6be052623310dcd1c76bc636a607561153359' 
  AND token = 'j27SAuzuNDUbhHsVTYbgXEzsOJo0LZUUyZdssn0hMgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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