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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7673181a6df562e9803e5bc25310674ad27495e1ed7a905c8b91be60774d75f0' 
  AND token = 'gl/K0L5N/8J6mWkbgsXFMTb8Tz1WF59fUN4lpO7+OvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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