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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcaddf300b8ef44e4fb208d028aed597977c9592222bf244c1d6b3aa4070e95' 
  AND token = '0T490KgKIRl/SMl5Fsq5CW2NSDwBGTkupiae17Aybfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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