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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f958f5e78db25dd1739bcc219bae543a4583d55116d056801d0c0049bd72fdb5' 
  AND token = 'fBh7dDCbv0HMWwA6+0wEL5gCIDZiMdiXdHbVkBCSxZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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