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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a6b9e71b54553eafc45780724da89224628cff8809ed942140f0883c904814' 
  AND token = 'D4wjlBrQWZOXA/LqijGRNGlpDbINKuiM4xz5Ef/A1Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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