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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89471624c32c3d710c4c130e0732ecf05c0ba24bc81af810b3351f654dc92c5a' 
  AND token = 'NBtNrxKv0VGBh9xZLsSEu5bGRq2y37BEnAGpVwa6hDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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