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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a464826e26778e74e3485b23a0d284db99ac689c76754a29134a8d717d7f81' 
  AND token = 'u0xWJ1ETxc/bK7WDi2ZsBP67sWmY8NP7/WOibsiHcsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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