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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf50245e30fc40e928dbd687ee73c25678f92b66761288327590a37ba5842843' 
  AND token = 'dcYtdw+O1cBL80IdVqG/OXsnXb653ATZRcP9OjvWAD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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