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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfec89a6ec0243ece2c00f9e88dfad248ea272c40e928dad46bb64d9e596c23b' 
  AND token = '9wSedlV7/261SERMLBGajM3lmA5CiawadG2wFZwVElA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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