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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ffd94cfb6aef2a1cbd32e657a9b94b26a9c499b6601d669c241edc2db91ef8' 
  AND token = 'rthSM8dBkrkFIehjZk68+MLpj7WOfnC5F7ADBtFs6zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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