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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81d73ad828d92215ed54733d4f8f1dcaa1b784586a0e91604809b843c3de0f5' 
  AND token = 'prO1Y6qphYhgo6ci4w+/SubQOI71E+kofTO/O8cL29Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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