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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b341d6b77594e17874e457f8f73c4af05c4ba402c8df7d960e20edd97c934e8' 
  AND token = '0BfgAYtzKz5cwy4s+zhOetgn73t65Rwwswg+D87aa6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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