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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a843ced1bdb1e07c2126eee8cb9c559c2872417693a253007fd9a5ccb4f224f5' 
  AND token = 'gSaB+ov1l89ZFGDe2CkgVVlpsJ0Acnerbb/tiCIIsJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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