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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4065e78df192e6b232a493c421e726a664266e3300aa17ad75fc385b30c9187c' 
  AND token = 'WRdMuj1sMStu9shlIYG2hw/c9zScifAemBZHkrx0gCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00631

JSON explain

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