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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d56a02c438d83b465eab1e3dbe5bc20c1c76c28a876d2e858bef9e1fc827c6a' 
  AND token = 'QrYW+EGCbYCdGxc+1AZhx9GVYpf/6wwKomdA5JOMoBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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