Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397f38c5c97425c1b988780e247b7416ce9aa6991f76625f66e1aef3de808029' 
  AND token = 'N8y51YZwybdHvCe9VbNcm9NLEbhzMbT7agrRAXNq9U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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