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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6217c5749b72340c8a7ee38afe93f6436f9d21cc8d449d76d1abbc171801e56' 
  AND token = 'EvNVCIxZ20+X5SBqQkZ2WtHGPH3H36O4mf6adGr7QYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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