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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b38f654c424acb28ee64b5725283b84f3998f5e16e9fe09085fd83630384bcb' 
  AND token = 'HsTyRw3xl2hpdCG8n+jQ0X5RJCYegIC2KEJID+fEfcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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