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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df04ed34e77196d729af4425b51b5fa997df4596c60a8f6a27a7a2af5fb37bb2' 
  AND token = 'PSqtNCkT5RAKSDsYtH+dhbrca6xfDUDNaq7226I2aSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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