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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc42c8bbc1298cdc0fb56f33ec440c055dd4f1e37b0bcfaba913959c4a665195' 
  AND token = 'orxwB4gVtMCyXyuIJieRM3qpwP7FzwX4LXHixRqUY7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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