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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f07147757ad19786e022c9531a78304897892b3078f9797a0fb5d0ad532bbd4' 
  AND token = '1JpFOCyTyjw+VMcgUhyq0CMANf0IMD9SnyxTYijSXUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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