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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41804b6de4bc2e4f38b6557665118d3c38ad7f9640bd401c912f651afa8217c3' 
  AND token = 'eStEluMcdG1WX8BSlBmIh10x8WIajebwwcBEg1ssOxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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