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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1121bfefec7b407572747ea99edddbd094c36271d0cd72034b9456fc5a190ed5' 
  AND token = '86f7TbXt+hAQNFBKYQvVPtdLk2ll1Ae5ZjVeCuoj3Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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