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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cad3b9b03b3765b4c48dd87b3f78e3a05f8b90896860fc9b0541320a99544a' 
  AND token = 'wf0FwKd2YuNceTOTm4fGWg7wW7Q8jdzizfl2ndSCavE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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