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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f028899cbf7480652c9f1289b0a10a8f5417e157a25c0174905f12234566074c' 
  AND token = 'DHOGk+htmh6sLEPuup7O3k5y5t8GTr/uIVBWxY5XPDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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