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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f515af7444f8f4ab09a0c3ea205ead3420b1dfacb6ade4c61fd0a270e989fb9c' 
  AND token = 'jOSvytpFUAjNKGIIi4ZSGoJEFKP7LvvRzIvXO6QAq2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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