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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ec6b3abd87f83913ea56356667fc1b00d95435e41b7bf9c6c71566eb662900' 
  AND token = 'f9m/F6jEkAMsEjF8CRQLCIyaqS8jyl8KFGD639RApF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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