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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23144ffaef192943b4bd75a20fdc78e661f727741338f0e5be3b46f069a6d20c' 
  AND token = 'VyuP3LTxl2ZRli8TGUia63nS5oU7fnh0BplnY1VTK64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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