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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41d74ef6283c817e2765016d8a36638f4a3a977c0e66176074862c75a272f54' 
  AND token = 'kUiDhsS1WXXdZREk2bNpGJ9nEzScN42hfqlDmAI/Ii4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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