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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacdae70c72a18e7d21c432a6a5a4d73087a1628e89489b63b8129715c1d883f' 
  AND token = 'Lo1evo36agLoVA/VEmADlJuw1RHNyIUF9ubc+gBvkww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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