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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9ed4c1eb9913d10067135759d2e0c2dcc6a73691f28191a6feb3d07b8c3650' 
  AND token = 'avRie7uuEujDD8dFcVxYm5hceIcoh06i73KDXGQ7a3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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