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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc28686153f4a85e10bd61a6804d4a5063dcdfc411eaac5a6a7c805f37f0bb0' 
  AND token = 'itcMRKkQgz7n/Y5LJIoFOyZVIG8dcOjaHckwXQcA0Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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