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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb235f1c5449ebdd886f8e2ca083d68266a6d529432bfa4c6ad7dba2678112d' 
  AND token = 'rLh/rJsIEomadkYuIc1PGAYdGff9vvR9NYwSOm3k8G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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