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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a202da693d4f2619edd6730af4c05039fd05099f17c144217950b8ee8658ff8' 
  AND token = '8ATfJ7ikBdkf8mHD+7jAwDEXOppwoETxbM9s86QsD+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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