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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3d941e798d13e6d9aa5dea3e549781f9ef334c5bd2304f55853e520187ff61' 
  AND token = 'SgLSoQzDe9efzG0WriOxK9Wq3497RlwbmE/SRxbjuhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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