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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913d07fe1ae8f425fc2215892ce2f8ceb0c5a6d3d02a49c71bedffe1c5843d68' 
  AND token = '6inW31E5oYW79iDgAyq/gWrVFbvrquMs3UiEIUyvHwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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