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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cb5f8eba2d8ab6ec04ce138dcfe9100b541eac22e84b7809bddf2ee99742aa' 
  AND token = 'zeB10MDsynR38vlsF5EqaRE8JeVZ8WS2BbqXEI9/Wbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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