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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52449cd6cd62f87718111b9ca20fb8b250c3ca83a0f02904d1b4182e1de1777' 
  AND token = 'QHclX1kiOw1tyZwx4Nd3xTkpewPlWAEyalr/sNpdKvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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