SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461367685651386a6f63c65d94d11e2d224209ba681f6d44f98381e9c2e536e4' 
  AND token = 'ljQ/PbWPIrRZ7ToaZqgpkq9CF3CZwMJfGqUrpjQ+0Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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