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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3325896ba53062382fdf47958882ae8d36de5d49697a8704333e1b94e8f3500d' 
  AND token = 'ku85HO3LeswItUD/zJgUwqH0d5UactxS5JJ3bxZH82M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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