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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9539ec2bc601f6ae13e9b97f1f706a262ec454a3dec8731afebe03867418d47' 
  AND token = 'aP+AU0aEZNdt1Jrwn926aFpl/rVTeQNKxMLIVmwxrQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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