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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f6e3f2776c736436a12c10f1dbbce924c63097aebae4db38b141f07e56fd13' 
  AND token = 'PLEQ/J1QXYEtdSKPibOBKGiWM6Tzvih0sDOt3G2ctCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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