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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ed680cf95e65878587e92895eb4d542dfc2a52113d2a325fe3771aa62534d9' 
  AND token = 'J2LFrSGRszGKXTWlfppxEy8tpmha656FqrWQOGd0Zwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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